一种SIR结构的超宽带带通滤波器
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摘要
提出了一种基于阶梯阻抗谐振器(Step Impedance Resonator,SIR)结构的具有平行耦合微带线的超宽带(Ultra-wideband,UWB)带通滤波器。滤波器采用孔径补偿技术设计,在地面上蚀刻两个矩形槽,以增强顶层微带线之间的耦合。为了优化S参数并改善带外的抑制,在谐振器中采用了缺陷微带结构(Defective Microstrip Structure,DMS)。仿真结果表明,滤波器的通带范围为2.3～6.1 GHz,中心频率为4.2 GHz,分数带宽(Fractional Bandwidth,FBW)大于90.4%;插入和回波损耗分别优于-1 dB和-10 dB;通带中群延迟的变化范围为0.4～0.6 ns,滤波器的线性度良好。该滤波器可用于5G通信系统。
An ultra-wideband(UWB) bandpass filter with parallel coupled microstrip lines based on step impedance resonator(SIR) structure is propsed.The filter is designed using aperture compensation technique which etches two rectangular slots on the ground to enhance the coupling between the microstrip lines on the top layer.In order to optimize the S parameter and improve the suppression out of the intersting band,the defective microstrip structure(DMS) is adopted in the resonator.The results of simulation show that the passband range of the filter is 2.3～6.1 GHz,the center frequency is 4.2 GHz and the fractional bandwidth(FBW) is greater than 90.4%.The insertion loss and return loss are better than -1 dB and-10 dB,respectivety.The variation range of group delay in passband is 0.4～0.6 ns and the linearity of filter is good.The filter can be applied in 5G communication systems.
An ultra-wideband(UWB) bandpass filter with parallel coupled microstrip lines based on step impedance resonator(SIR) structure is propsed.The filter is designed using aperture compensation technique which etches two rectangular slots on the ground to enhance the coupling between the microstrip lines on the top layer.In order to optimize the S parameter and improve the suppression out of the intersting band,the defective microstrip structure(DMS) is adopted in the resonator.The results of simulation show that the passband range of the filter is 2.3～6.1 GHz,the center frequency is 4.2 GHz and the fractional bandwidth(FBW) is greater than 90.4%.The insertion loss and return loss are better than -1 dB and-10 dB,respectivety.The variation range of group delay in passband is 0.4～0.6 ns and the linearity of filter is good.The filter can be applied in 5G communication systems.
引文
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[2] SCHWAB W.Full-wave design of parallel-coupled microstrip band-pass filters with aligned input and output lines[C]//Proceedings of 1996 26th European Microwave Conference.Prague:IEEE,1996:418-421.
[3] KIANI S,REZAEI P,KARAMI M,et al.Substrate integrated waveguide quasi-elliptic bandpass filter with parallel coupled microstrip resonator[J]. Electronics Letters,2018,54(10):667-668.
[4] ZHU L,BU H,WU K.Aperture compensation technique for innovative design of an ultra-broadband microstrip bandpass filter[C]//Proceedings of 2000 IEEE MTT-S International Microwave Symposium Digest.Boston:IEEE,2000:315-318.
[5] ZHU L,WANG H.Ultra-wideband bandpass filter on aperture-backed microstrip line[J]. Electronics Letters,2005,41(18):1015-1016.
[6] ZHU L,BU H,WU K.Broadband and compact multipole microstrip bandpass filters using ground plane aperture technique[J]. IEE Proceedings—Microwaves,Antennas and Propagation,2002,149(1):71-77.
[7] ZHU L,BU H,WU K.Aperture compensation and multipole generation techniques leading to the emergence of a new planar filter[C]//Proceedings of 2000 Microwave Conference.[S.l.]:IEEE,2000:1310-1314.
[8] ZHU L,SUN S,MENZEL W. Ultra-wideband(UWB)bandpass filters using multiple-mode resonator[J]. IEEE Microwave and Wireless Components Letters,2005,15(11):796-798.
[9]褚庆昕,涂志红,陈付昌,等.新型微波滤波器的理论与设计[M].北京:科技出版社,2016.
[10]罗杰,冯菊,周海京,等.小型化宽频带宽阻带微带滤波器的设计[J].电讯技术,2014,54(10):1430-1434.
[11]雷涛,向天宇,张正平.基于E型双模谐振器的源负载耦合带通滤波器设计[J].电讯技术,2014,54(8):1129-1133.
[12] SAIFULLAH N,ZAKARIA Z,SALLEH A,et al.Integrated low noise amplifier with notch filter using DMS technique for ultra-wideband application[C]//Proceedings of 2016 3rd International Conference on Electronic Design(ICED).Phuket:IEEE,2016:56-61.
[13]陈会.现代无线系统射频微波平面电路[M].北京:电子工业出版社,2016.
[14] ZHENG X,WANG H,SUN Y. Analysis of microstrip bandstop filter characteristic based on defected microstrip structure[C]//Proceedings of 2017 Progress in Electromagnetics Research Symposium-Spring(PIERS).St. Petersburg:IEEE,2017:704-707.